https://bugs.winehq.org/show_bug.cgi?id=55876
--- Comment #4 from Andrew Nguyen arethusa26@gmail.com --- The installer is doing a file version check on the builtin oleaut32.dll. As the version of the builtin (6.0.6001.18000) is older than what the installer is expecting, it replaces the 32-bit oleaut32.dll with its bundled 64-bit version during the installation, which results in the breakage observed. Wine doesn't seem to fall back to the builtin oleaut32.dll if loading the native version fails.
The installer's behavior is buggy and occurs even in a 32-bit Wine prefix, but it would only have been visible if it ran on a sufficiently old version of Windows, as the bundled oleaut32.dll has version 6.1.7601.17676, which is slightly newer than version 6.1.7601.17514 of oleaut32.dll in base Windows 7 SP1.
After updating the oleaut32.dll resources to use the version info of the bundled library, I can run the installer to completion successfully.